A3 Engineering
- Croonwolterendros (Installatietechniek)
- Thermo Fisher Scientific; Groningen (Pharma)
- LyondellBasell; Botlek & Europoort (Petro- Chemie)
- Vattenfall; Eemshaven (Power Plant)
- BOHLEN DOYEN; Nordhorn – Antwerpen (P/M)
- BESA Engineering; Beilen (Food)
- FrieslandCampina Domo; Bedum (Food)
- Electrabel Power Plants; Locaties in Nederland en België (Power Plant)
- NEM / ENECO; Utrecht (Power Plant)
- Visser & Smit Hanab; Veendam (P/M)
- A. Hak; Veendam (ENECO Power Plant, P/M)
- NAM; Grijpskerk, Langelo, Velzen-Noord, Emmen, Koostertille, Assen (P/M)
- Clyde Petroleum Company; Waalwijk (P/M)
- Johnson Polymer; Garijp (P/M)
- Elf Petroland, (P/M)
- BAM /NBM, Wolvega (P/M)
- Wärtsila; Zwolle (Gasmotoren Ultra Lean Pre-Combustion)
Note: P/M = Piping & Mechanical